package com.myway.utils;
  
import java.text.ParseException;   
import java.text.SimpleDateFormat;   
import java.util.Calendar;   
import java.util.Date;   
  
public class Lunar {   
    private int year;   
    private int month;   
    private int day;   
    private boolean leap;   
    final static String monthNumber[] = {"01", "02", "03", "04", "05", "06", "07", "08", "09", "10", "11", "12"};   
    final static String dayNumber[] = {"01", "02", "03", "04", "05", "06", "07", "08", "09", "10", "11", "12","13", "14", "15", "16", "17", "18", "19", "20", "21", "22", "23", "24","25", "26", "27", "28", "29", "30","31"};
    static SimpleDateFormat chineseDateFormat = new SimpleDateFormat("yyyy-MM-dd");   
    final static long[] lunarInfo = new long[]   
       {0x04bd8, 0x04ae0, 0x0a570, 0x054d5, 0x0d260, 0x0d950, 0x16554, 0x056a0, 0x09ad0, 0x055d2,   
     0x04ae0, 0x0a5b6, 0x0a4d0, 0x0d250, 0x1d255, 0x0b540, 0x0d6a0, 0x0ada2, 0x095b0, 0x14977,   
     0x04970, 0x0a4b0, 0x0b4b5, 0x06a50, 0x06d40, 0x1ab54, 0x02b60, 0x09570, 0x052f2, 0x04970,   
     0x06566, 0x0d4a0, 0x0ea50, 0x06e95, 0x05ad0, 0x02b60, 0x186e3, 0x092e0, 0x1c8d7, 0x0c950,   
     0x0d4a0, 0x1d8a6, 0x0b550, 0x056a0, 0x1a5b4, 0x025d0, 0x092d0, 0x0d2b2, 0x0a950, 0x0b557,   
     0x06ca0, 0x0b550, 0x15355, 0x04da0, 0x0a5d0, 0x14573, 0x052d0, 0x0a9a8, 0x0e950, 0x06aa0,   
     0x0aea6, 0x0ab50, 0x04b60, 0x0aae4, 0x0a570, 0x05260, 0x0f263, 0x0d950, 0x05b57, 0x056a0,   
     0x096d0, 0x04dd5, 0x04ad0, 0x0a4d0, 0x0d4d4, 0x0d250, 0x0d558, 0x0b540, 0x0b5a0, 0x195a6,   
     0x095b0, 0x049b0, 0x0a974, 0x0a4b0, 0x0b27a, 0x06a50, 0x06d40, 0x0af46, 0x0ab60, 0x09570,   
     0x04af5, 0x04970, 0x064b0, 0x074a3, 0x0ea50, 0x06b58, 0x055c0, 0x0ab60, 0x096d5, 0x092e0,   
     0x0c960, 0x0d954, 0x0d4a0, 0x0da50, 0x07552, 0x056a0, 0x0abb7, 0x025d0, 0x092d0, 0x0cab5,   
     0x0a950, 0x0b4a0, 0x0baa4, 0x0ad50, 0x055d9, 0x04ba0, 0x0a5b0, 0x15176, 0x052b0, 0x0a930,   
     0x07954, 0x06aa0, 0x0ad50, 0x05b52, 0x04b60, 0x0a6e6, 0x0a4e0, 0x0d260, 0x0ea65, 0x0d530,   
     0x05aa0, 0x076a3, 0x096d0, 0x04bd7, 0x04ad0, 0x0a4d0, 0x1d0b6, 0x0d250, 0x0d520, 0x0dd45,   
     0x0b5a0, 0x056d0, 0x055b2, 0x049b0, 0x0a577, 0x0a4b0, 0x0aa50, 0x1b255, 0x06d20, 0x0ada0};   
  
    //====== 传回农历 y年的总天数   
    final private static int yearDays(int y) {   
        int i, sum = 348;   
        for (i = 0x8000; i > 0x8; i >>= 1) {   
            if ((lunarInfo[y - 1900] & i) != 0) sum += 1;   
        }   
        return (sum + leapDays(y));   
    }   
  
    //====== 传回农历 y年闰月的天数   
    final private static int leapDays(int y) {   
        if (leapMonth(y) != 0) {   
            if ((lunarInfo[y - 1900] & 0x10000) != 0)   
                return 30;   
            else  
                return 29;   
        } else  
            return 0;   
    }   
  
    //====== 传回农历 y年闰哪个月 1-12 , 没闰传回 0   
    final private static int leapMonth(int y) {   
        return (int) (lunarInfo[y - 1900] & 0xf);   
    }   
  
    //====== 传回农历 y年m月的总天数   
    final private static int monthDays(int y, int m) {   
        if ((lunarInfo[y - 1900] & (0x10000 >> m)) == 0)   
            return 29;   
        else  
            return 30;   
    }   
  
    //====== 传回农历 y年的生肖   
    final public String animalsYear() {   
        final String[] Animals = new String[]{"鼠", "牛", "虎", "兔", "龙", "蛇", "马", "羊", "猴", "鸡", "狗", "猪"};   
        return Animals[(year - 4) % 12];   
    }   
  
    //====== 传入 月日的offset 传回干支, 0=甲子   
    final private static String cyclicalm(int num) {   
        final String[] Gan = new String[]{"甲", "乙", "丙", "丁", "戊", "己", "庚", "辛", "壬", "癸"};   
        final String[] Zhi = new String[]{"子", "丑", "寅", "卯", "辰", "巳", "午", "未", "申", "酉", "戌", "亥"};   
        return (Gan[num % 10] + Zhi[num % 12]);   
    }   
  
    //====== 传入 offset 传回干支, 0=甲子   
    final public String cyclical() {   
        int num = year - 1900 + 36;   
        return (cyclicalm(num));   
    }   
  
    /** *//**  
85.     * 传出y年m月d日对应的农历.  
86.     * yearCyl3:农历年与1864的相差数              ?  
87.     * monCyl4:从1900年1月31日以来,闰月数  
88.     * dayCyl5:与1900年1月31日相差的天数,再加40      ?  
89.     * @param cal   
90.     * @return   
91.     */  
    public Lunar(Calendar cal) {   
        @SuppressWarnings("unused") int yearCyl, monCyl, dayCyl;   
        int leapMonth = 0;   
        Date baseDate = null;   
        try {   
            baseDate = chineseDateFormat.parse("1900-01-31");   
        } catch (ParseException e) {   
            e.printStackTrace();  //To change body of catch statement use Options | File Templates.   
        }   
  
        //求出和1900年1月31日相差的天数   
        int offset = (int) ((cal.getTime().getTime() - baseDate.getTime()) / 86400000L);   
       dayCyl = offset + 40;   
        monCyl = 14;   
  
        //用offset减去每农历年的天数   
        // 计算当天是农历第几天   
        //i最终结果是农历的年份   
        //offset是当年的第几天   
        int iYear, daysOfYear = 0;   
        for (iYear = 1900; iYear < 2050 && offset > 0; iYear++) {   
            daysOfYear = yearDays(iYear);   
            offset -= daysOfYear;   
            monCyl += 12;   
        }   
        if (offset < 0) {   
            offset += daysOfYear;   
            iYear--;   
            monCyl -= 12;   
        }   
        //农历年份   
        year = iYear;   
  
        yearCyl = iYear - 1864;   
        leapMonth = leapMonth(iYear); //闰哪个月,1-12   
        leap = false;   
  
        //用当年的天数offset,逐个减去每月（农历）的天数，求出当天是本月的第几天   
        int iMonth, daysOfMonth = 0;   
        for (iMonth = 1; iMonth < 13 && offset > 0; iMonth++) {   
            //闰月   
           if (leapMonth > 0 && iMonth == (leapMonth + 1) && !leap) {   
                --iMonth;   
                leap = true;   
                daysOfMonth = leapDays(year);   
            } else  
                daysOfMonth = monthDays(year, iMonth);   
  
            offset -= daysOfMonth;   
            //解除闰月   
            if (leap && iMonth == (leapMonth + 1)) leap = false;   
            if (!leap) monCyl++;   
        }   
        //offset为0时，并且刚才计算的月份是闰月，要校正   
        if (offset == 0 && leapMonth > 0 && iMonth == leapMonth + 1) {   
            if (leap) {   
                leap = false;   
            } else {   
                leap = true;   
                --iMonth;   
                --monCyl;   
            }   
        }   
        //offset小于0时，也要校正   
        if (offset < 0) {   
            offset += daysOfMonth;   
            --iMonth;   
            --monCyl;   
        }   
        month = iMonth;   
        day = offset + 1;   
    }    
    public String toString() {   
        return year + "-" + monthNumber[month - 1] + "-" + dayNumber[day-1];   
    }   
  
    public static void main(String[] args) throws ParseException {   
        Calendar today = Calendar.getInstance();   
        today.setTime(chineseDateFormat.parse("2026-09-15"));   
        Lunar lunar = new Lunar(today);   
  
        System.out.println("北京时间：" + chineseDateFormat.format(today.getTime()) + "　农历" + lunar.toString());   
    }   
}   